code: def _set_tf_op(op_type, _op_func):
      _TF_OPS_REGISTRY[op_type] = _op_func
  
file_path: turicreate/src/external/coremltools_wrap/coremltools/coremltools/converters/mil/frontend/tensorflow/test/test_custom_ops.py
imports: from coremltools.converters.mil import testing_reqs
  from coremltools.converters.mil.testing_reqs import *
  from coremltools.converters.mil.frontend.tensorflow.test.testing_utils import make_tf_graph, tf_graph_to_proto, run_compare_tf
  from coremltools.converters.mil.frontend.tensorflow.tf_op_registry import register_tf_op
  from coremltools.converters.mil.frontend.tensorflow.tf_op_registry import _TF_OPS_REGISTRY
  from coremltools.converters.mil.mil.ops.defs._op_reqs import *
  from coremltools.converters.mil.mil import Builder
  from coremltools.converters.mil.mil.types.symbolic import is_symbolic
label_desc: Use image node_id 2 for calling a global function with example usage: _set_tf_op(op_type, _op_func) without return types